What Is the CO 97 Denial Code?

The CO 97 Denial Code—“The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated”—is one of the most frustrating and misunderstood denials in medical billing.

In simple terms, it means bundling rules were applied, and the payer considers the denied service as part of another already-paid procedure.

While this may sound straightforward, mishandling CO 97 can silently drain revenue, delay reimbursements, and create compliance risks.

Why CO 97 Denials Are Costing You More Than You Think

CO 97 errors aren’t just minor billing hiccups—they’re profit leaks. When left unchecked, they can:

• 🚫 Reduce clean claim rates

• ⏳ Delay payments and increase A/R days

• 🔁 Trigger unnecessary rework and appeals

• ⚠️ Raise compliance concerns with improper unbundling

Healthcare organizations that fail to address these denials proactively often experience significant revenue loss over time.

The Most Common CO 97 Denial Code Mistakes

Understanding the root causes is the first step toward eliminating them. Here are the top mistakes providers and billing teams make:

1. Incorrect Unbundling of Services

Billing procedures separately when they should be bundled is the #1 trigger. Many coders unintentionally bypass bundling rules.

2. Lack of Modifier Usage (or Misuse)

Failing to apply appropriate modifiers (like -59, -25, or -91) can result in automatic denials—even when services are legitimately separate.

3. Outdated Coding Knowledge

Medical coding guidelines evolve constantly. Using outdated CPT or payer-specific rules leads to avoidable denials.

4. Ignoring National Correct Coding Initiative (NCCI) Edits

NCCI edits define which services can and cannot be billed together. Ignoring them is a direct path to CO 97 denials.

5. Poor Documentation

Insufficient or unclear documentation makes it impossible to justify separate billing—even when it’s appropriate.

Powerful Tips to Avoid CO 97 Denial Code Errors

Eliminating CO 97 denials requires a strategic, proactive approach. Here’s how top-performing billing teams stay ahead:

✅ 1. Master Bundling Rules and NCCI Edits

Train your coding team to thoroughly understand bundling logic and NCCI edits. Use updated resources and software tools to validate codes before submission.

✅ 2. Use Modifiers with Precision

Modifiers are powerful—but only when used correctly. Ensure your team knows:

• When modifiers are appropriate

• Which modifiers apply to specific scenarios

• How to document their use properly

✅ 3. Strengthen Clinical Documentation

Clear, detailed documentation is your strongest defense. Encourage providers to:

• Justify medical necessity

• Clearly distinguish separate services

• Avoid vague or incomplete notes

✅ 4. Conduct Regular Coding Audits

Routine audits help identify patterns, catch errors early, and improve accuracy. Focus on:

• High-volume procedures

• Frequently denied claims

• Provider-specific trends

✅ 5. Leverage Advanced Billing Technology

Modern billing software can flag bundling conflicts in real time, reducing manual errors and boosting efficiency.

✅ 6. Invest in Continuous Staff Training

Empower your team with ongoing education. Billing regulations change frequently, and staying updated is critical for long-term success.

Pro Tip: Don’t Rush to Appeal Every CO 97 Denial

Not all CO 97 denials are incorrect. Before appealing, ask:

• Was the service truly separate?

• Is there documentation to support it?

• Were correct modifiers used?

Smart billing teams analyze before acting, saving time and resources.

Transform Denials into Revenue Opportunities

CO 97 denials don’t have to be a constant headache. With the right strategy, they can become valuable insights into improving your billing process.

Organizations that take control of their denial management see:

• 📈 Higher reimbursement rates

• ⚡ Faster claim processing

• 💡 Improved operational efficiency

Why HMS Group Inc Is Your Trusted Partner

At HMS Group Inc, we specialize in turning complex billing challenges into clear, profitable solutions. Our expert-driven training and revenue cycle strategies empower healthcare providers to:

• Eliminate recurring denial patterns

• Optimize coding accuracy

• Maximize revenue with confidence

We don’t just teach billing—we help you master it.

Final Thoughts: Take Control of CO 97 Denials Today

CO 97 denial code mistakes are avoidable—but only if you take decisive, informed action.

By improving coding accuracy, strengthening documentation, and investing in education, you can dramatically reduce denials and unlock hidden revenue.

🚀 Ready to Eliminate Denials and Boost Revenue?

Partner with HMS Group Inc today and gain access to industry-leading medical billing education, expert insights, and proven strategies that deliver results.

Stop losing revenue. Start maximizing it.